Refrigerating-machine.



H. E. WHITE REFRIGERATING IIIACHINE.`

APPLICATION FILED UG.3, i915.v

21,2455544'@ mm@ NW 6, 19u.

7SHEETS-SHEET 2.

6MM @M H. E. IWHITE.

REFRIGERATING MACHINE.

APPLICATION FILED AUG-S 1315.

Patented. Nov. 6, 1917.

YSHEETS-SHEET 3.

H. E. WHITE. l

HEFRIGERATING MACHINE.` APPLICATION FILED AuG.a. 1915.

` 1,245,544. Patented-NOV. 6, 1917.

7 SHEETS-SEHEN 4.

2j. E; J1/MTE.

REFRIGERATINGA MA APPLICATION FILED Auw. 19a-5.

SHEETS-SHEET 5.

. WHITE.

REF NG MACHINE, APPLICA l N LED AUG.3.-`19l5 v Patented Nov.' 6, 1917. v l I SHEETs-SHEH 7.

mmm@

ing capacity is required.

UNITED sfrarns man .1f for-Fica.

HERBERT E. WHITE, OF YOUNGSTOVN, OHIO, ASSIG-NOR T0 THE GENERAL FIREPROOFING- COMPANY, .A CORPORATION OF OHIO.

REFRIGERATIN (ir-MACHINE.

Application led August 3, 1915. .Serial No. 43,379.

To all whom it may concern.'

Be "it known-that I, HERBERT E. HTHITE, a. citizen of the United States, residing aty Youngstown, in the county of Mahoning and State of Ohio, Ahave invented certain new and useful Improvements in Refrigerating- Machines, of which the following is a specification.

This invention relates to refrigerating machines of the intermittent absorption type, particularly designed for household and other uses where relatively small refrigerat- A primary object'of provide novel and practical means for positively-and-reliably changing the cycles of operation'in the system regardless of pressure andA temperature conditions. yln that aspect, the present invention distinguishes from the type of refrigerating machines wherein the change of cycle is automatically brought about when the temperature in certain parts ofthe apparatus reaches a certain degree, or when the pressure in certain locations exceeds a predetermined amount.

In refrigerating machines, of the type wherein the change in the cycle of operations is automatically effected by the changes in temperature or pressure conditions, it has been found in practice that the instrumentalities requiredto bring about the necessary results are usually so delicate andl unreliable as to frequently render the whole device inoperative, and thereby offset the advantages otherwise possessed by pressure and temperature controlled instruments.

-Accordingly, a distinctive feature of the present invention resides in entirely dispensing with the use of temperature and pressure controlled instruments for effecting the change of cycle, and to substitute therefor a .simple and economical cycle-changing device Specification of Letters Patent.

the invention is to' Patented Nov. 6, 191 7.

the sense that it continues its cycles so long as it is supplied with water and fuel. y

lVith these and other objects in view which will be recognized by those familiar with the refrigeiating art, the invention consists in the novel construction, combination, and arrangement of parts hereinafter moie fully described, illustrated, and claimed.

The novel cycle-changing device and other features of the invention are necessarily susceptible of a wide range of structural modiiication without departing from the spirit or scope of the invention, as defined in the appended claims, but, for illustrative purposes, certain preferred and practical embodiments lof the invention are shown in the accompanying drawings, in which- Figure l is a side elevation of arefrigerating machine embodying the improvements contemplated by the presentvinvention.

Fig. 2 is a similar view, but partly in section. of the opposite side of the machine.

Fig. 3 is a top plan view of the machine with a part of the piping omitted.

Fig. 4 is a rear'end elevation of the complete machine.

Fig. 5 is a vertical cross sectional view on the line 5 5 of Fig. 2,4illustrating the i Fig. 10 is a plan view of themotor cylinder case illustrating one form of construction for coupling together the pairedv circu. latiiig ports of the piston and valve chainbers.

Fig. 1l is cross sectional view on the line ll-ll of Fig. l0, illustrating the inlet and exhaust connections for the two chambers oitthe motor.

Fig. 12 is a detail sectional View on the line 12-12 of Fig. l1 illustrating the means.,

for taking care of the exhaust from both chambers.

Fig. 13 ofthe drawings is a detail vieivof A' a preferable form of construction employed fico as the return valve for the piping connecting i the generator-absorber with the condenser.

Similar reference characters designate corresponding parts throughout the several gures of the drawings.

A refrigerating` system embodying the present invention includes inits general organization, a genmating-absorbing unit and the novel cycle-changing device refer-red to. For purposes of illustration, the generatingabsorbing unit is shown as principally comprising a generator-absorber proper, designated by the letter R, and a condenser designated by the letter C. t

The generator-absorber R consists of a closed retort or tank of suitable capacity adapted to be partially filled with ammonia or an equivalent refrigerant liquor, and having associated therewith a heater 1 and a spray pipe 2 which are alternately operative as the retort R functions as a generator or as an absorber, plained.

The condenser C as hereinafter fully exof the generating-absorbing unit primarily includes a set or sets of condenser `coils 3, arranged within the i water tank l receiving its supply of water at the top from a feeding pipe 5, and having a Water overflow outlet 6 at a convenient point adjacent the top thereof. The piping 3, constituting the condenser coils, has sepa- 'rate circulating pipe terminals 7 and 8 respectively, the latter pipe terminal beingl in communication with the other parts of the apparatus to be presently explained, and

'the pipe terminal 7 being in communication With the circulating passageway 9 of a'return valve 10. This return valve may be of any suitable construction, but is preferably of the simple form illustrated in Fig. 13.

It consists of a casing 11 chambered to provide the passageway 9 and having a plurality of ports 12, 13 and 14, all in communication with said passageway and respectively communicating with the condenser ipe terminal 7, the refrigerant vapor pipe 15, and the refrigerant return pipe 16. The said return valve 10 also includes a ball or equivalent check valve 17 loperating over a seat 18 in communication with the port 13, and limited or restrained in its movement by an adjustable stop screw 19 mounted in the valve casing 11 in line with the move- `ment of the valve 17.

The refrigerant vapor pipe 15 extends from the point of connection with thereturn valve to the generator-absorber retort Rand connects with the vapor outlet pipe member The heater 1 preferably consists of a Bunrises.

sen burner tube extending longitudinally of the retort beneath the same, and provided in its upper side with a series of burner openings 23, at which point the heating iiamc is provided for 'heating the retort during the generating cycle when the ammonial liquor is vaporizing to yield the ammonia vapor or gas, The gas fuel may be supplied to the lunsen burner in any suitable manner, but preferably through a gas feed pipe 2G communicating With ,a suitable air mixer 27 rat one end of the burner tube 1, and also in communication with the outlet port 28 of a gas control valve 29 Whose inlet port 30 is in communication with the'gas main 31 which supplies the fuel gas to the apparatus. This gas control valve 29 may be of any suitable construction including a turning plug 32 having ports arranged therein to provide for opening and closing the supply of gas to the pipe 26 according to the requirements of the'apparatus, and this plug 32 has fitted to the spindle thereof a controlling pinion 33 which is operated periodically by the valve Aactuating member 3-1 of the cycle-changing device.

1n connection With the gas supply for the heater or burner which supplies the heat for the retort R when operating as a generator, it is desirable to provide the line of piping "constituting the gas feed pipe 26 With a hand-controlled cut-0E .or regulating valve 35 which may be manipulated as occasion requires to increase or diminish the iiow of gas through the pipe 26, orfto entirely cut off the same. To maintain the apparatus in operative position at all times, there is a'ssociated with the burner tube l a pilot burner tube- 3G having a connection with the gas supply main 31 so that a pilot light may be maintained at all times over the burner tube to provide for automatically relighting the heater at the beginning of the generating cycle.

Also, the line of piping 26 preferably includes therein a ,thermostatic valve 37 of any suitable construction and which is in communication with a closed thermostat .tube 3S screwed or soldered into one end of the retort land extending finto the interior of the latter. As indicated, the said thermostaticcontrolling valve 37 may be of any of the Well known types, such as are used on domestic water tanks, and the same set to restrict the supply of fuel gas fed to the burner 1 as the temperatureA in the retort R In this connection, it should be observed that it is desirable to limit the temperature of the Vgenerator-absorber during the heating or generating cycle to about 12 275o as a maximum, and it is for this purpose that lthe thermostatic valve is employed.

During the absorbing cycle of the machine, the cooling spray pipe 2 comes into play. This spraypipe is arranged longil tudinally of the retort .above the latter and is provided at its under side with the longitudinal series of spray openings 25 (Fig. 5) through which the water issues, and is jetted onto the top of the retort .R. The cooling water will entirely envelop and flow over the external surface of the said retort,

but will be prevented from iiooding onto the burner tube 1 by reason of suitablebafles 39 provided upon the under side of the retort at both sides of the vertical plane of the burner tubeA 1. These baffles may be of trol .valve 43 h'aving the 4inlet port 44 fon the waterm'ain connection 42 and the separate outlet ports 45 and 46. The outlet port 45 is in communication with the water feed pipe 47 which delivers water tothe cooling spray pipe 2, and isprovided with an independent hand controlled regulating Valve 48,

whileA theloutlet port 46 connects with the waterv feeding pipe 5 .for the condenser tank' 4, saidpipe 5 being also provided with its independent hand controlled regulating valve 49.

The three-way water control valve 43 includes a conventional form of turning plug 50 having ports coperating with. those of the casing, but according to the present in vention the external stem of said turning plug is provided with a controlling pinion 51 engaged and operated by the oscillatory valve actuating member 34 of the cyclechanging device. It will thus be seen that the said valve-actuating member of the said cycle-changing device engages and operates the controlling' elements of both the gas and water control valves 29 and 43 respectively, and alternately operates these valves at certain predetermined periods to provide forautomatically changing the cycles of operation in the machine.

(The cycle-changing device includes in combination vwith the valve controlling pinions33. and` 51Vand the oscillatory valve actuating member- 34, suitable motor controlled operating means for causing the slow periodical oscillation of the said member 34. The motor controlled operating means for the actuator .34 include an intermittently propelled cam wheel 52 keyed upon a supporting s'haft`53 journaled in suitable bearings 54v of the machine stand or frame.

This cam wheel 52 is provided therein with a cam-groove or slot 55 in which travels the bearing 'roller 56'carried by the crank arm 57 of the valve actuating member 3,4. The said groove or slot 55 is so formed that the travel of the roller 56 therein will cause the valve actuating member 34 to alternately swing in opposite directions, and also to dwell in' a stationary position during each cycle of operation. It will also be observed that the said oscillating valve actuating` member 34 is a gear sector whose teeth mesh respectively with the controlling pinions 33 and 51, and which is pivotally mounted on a pivot axle orl shaft' 58 mounted in a stationary bracket or iiXed part of the machine v stand or frame, as clearly illustrated in Fig.

2 ofthe drawings.

To provide'for the cam wheel 52, the motor operated means for the 'valve actuator' also includes a pawl intermittently propellingA i and ratchet mechanism comprising a ratchet wheel 59 fast on the supporting shaft 53, and

a swinging pawl carrier 60 pivotally hung on the shaft 53 and carrying at its upper end a pivotally mounted advancing pawl 61 engaging the teeth of the ratchet wheel or disk 59. (See Fig. 1). rlfhe pawl carrier 60 is preferably in the form of an arm proj ect# ing both above and below the supporting shaft 53, the lower extension 62 of said arm being arranged to play between a pair of op-v positely arranged limiting stop screws 63 adjustably'mounted in nut members 64 carried by they depending hanger bracket 65 mounted on the machine standvcr frame. The adjustment of these oppositely disposed` stop screws 63 in connection with the corresponding-adjustment of the adjustable tappet screw 66 carried at the outer end of the piston stem 67 of the motor 68, providea means for adjustingthe throw of the pawl carrier 60, and thereby controlling the eX- tent of movement of the cam wheel upon each active stroke of the operating motor.

On its outward movement, the piston stem 67 engages against ythe upper end portion of the pawl carrier 60, providing for the forward stroke4 of the advancing pawl 61, while the return or idle stroke thereof may be conveniently provided for by'a retracting spring 69 whose opposite ends are respectively connected with the pawl carrier,as at 70, and to a fixed point of attachment, as at 71.- Also, in order to check the ratchet disk 59 and the cam wheel 52 against backward movement of the idle stroke of the pawl carrier, a check pawl 72 is preferably employed. This check pawl is pivotalljv` hung, as at`73, upon the lower end of the hanger bracket 65, and the engaging point'or bill 73 of the said pawl is held in operative engagement with the teeth of the disk 59 by a courts` terbalance or weightf74 carried at one enti, of the pawl ami..

The operating motor 68 for the cyclechanging device is preferably a simple form of slow speed water motor, and this type of motor may be most economically and ad vantageously employed in the machine, because it may be conveniently operated by the water which is necessarily supplied to the machine for cooling purposes. Accordingly, a motor supply pipe 75 may be conveniently interposed between the inlets of the water motor 68 and the water main 42, the said pipe 75 being provided with a regulating valve 76 by means of which the speed of the motor may be easily regulated. The motor is diagrammatically indicated in Figs. 1, 2, 3, 4 and 5 of the drawings.

' 'As stated, the operating motor may be of any suitable single-stroke type, though the I y construction shown in detail'in Figs. 6 to thereto, it will be seen that the motor con- .sists essentially of a cylinder case 77 provided therein ,with` the `separate piston and valve chambers? 8 and 79 respectively, each of which chambers has an inlet port connecl tion 80and 81. The piston chamber 78 has the inlet port connection '8O with the motor supply pipe 75, and the valve chamber 79 has the similar port connection 81 with the supply pipe 75, while the chamber 7 8 'is provided respectively upon opposite sides of the inlet port 80 with the exhaust ports 82 and 83, and the valve chamber 79 is pro vided with correspondingly located exhaust ports 84 and 85.` The said several exhaust ports may conveniently open into a common exhaust discharge passage 85a having a pipe connection 85b with the water tank 4 of the condenser C.

In addition to the inlet portsv 80 and 81 and the exhaust ports 82, 83, 84 and 85, the two chambers 78 and 79 of the motor have other intercommunicating ports which provide for feeding and exhausting the water to and from the chambers in such a manner as to cause the piston and the valve to slowly reciprocate to the various positions shown in the diagrammatic figures referred to.

These ports are arranged to circulate the water from one part of one chamber to a different part of the other chamber, and are arranged in pairs as clearly shown by the The piston chamber 7 8 accommodates a reciprocating piston member 96 rigidly connected with the inner end of the piston stein 67 which stem operates through a stufhng 'box 97 located at one end ofthe chamber 78.

itself, that is to say, consisting of af lurality n of spaced piston elements 101, and mtermcs diate connecting clearance necks, 1,02,- ast plainly shown in the drawings.

Referring briefly to the operation of the slow speed water motor above described, it will be observed by reference to the diagrammatic views that Fig. 6 illustrates the relative positions of the piston and the valve just .after the piston stem' 67 retreats from the pawl carrier 60. In this relative position ofY parts, water will pass in through the inlet port 80 into one of the spaces between the piston elements 98and will be Aconducted from thecirculating port 88 to the circulating port 89, wher-"cit escapesbehind one end of theJvalve 10'() :and causes the latter to be forced to the opposite end of the valve chamber 79, that is to the` position shown in Fig. 7 of the drawings. lNhile the valve 100 is moving to the position referredto, that is to the right (according to the positions shown' in the drawings), the water within the lright hand end of the chamber 79 will-be forced ioo out of the port 98 to the `port 'l2 and thence out through the exhaust passage 83, as will plainlyv appear by'reference to Figs. 6 and 7 of the drawings.

Now, after the parts have assumed the relative positions shown in Figs. 6 and 7 of the drawings, water willv be admitted through the port 81, thence through the port 87 to the port '86, from which it passesbehind one end of the piston 96, with the result of driving'the said piston forward (to the left inthe drawings), and. in this operation expelling waterthrough ports 90 and 91 and out through the exhaust 85. This op` erationprovides for bringing the parts in the relative positions shown in Fig. 8 of the drawings. Referring to that figure of the drawings, it will be seen that water will be now admitted through theinlet port 80, thence to 92, and out of 93, with-the result of forcing the valve to the left, at the same time expelling water through port 89 and port 88, and out through the exhaust port 82.' This operation. brings thel parts again to the relative positions shownin Fig. 9 of the drawings, whenwater will again enter the inlet port 81, and passing through port 91 to Aport 90 will vdrive the piston 96-tvo the right ndback'to-the psition of parts 4 shown in 6 ofthefdrawngs. F romv this,

the generator absorber is partially lled.

with strong ammonia liquor. This liquor is generally of the temperature of the atmosphere in which the apparatus stands, and the piping and receivers connected With the generator absorber are free from air and filled With the ammonia g'as. In starting the apparatus, the intermittently propelled cam Wheel 52 is turned manuallyl until the sector or valve actuating member 34 turns the controlling pinion 33 forthe gas control valve 29 to such a position that .the latter is opened and the fuel. gas is fed from the gasmain 31 to the gas feed pipe 26. Thence the gas is fed to the burner or heater 1 under the retort, Where the gas is ignited from the pilot burner 36 fed directly' from the 'Igas' main 31, as previously described. he burner or heater 1 thus becomes active, With the result of heating the generator absorber tank R and the ammonia liquor contained therein, thereby causing the liquor to yield up its. vapor which passes out through the vapor pipes 20-15 through the return valve 10. During this cycle, that is While the retort is being heated from the burner, no ammonia gas or vapor will pass out of the retort through the pipes 21 and 16because of the fact that the pipe 21 opens into the retort of the generator absorber below the surface of the liquor therein. Also, the pressure generated within the retort by the disengagement of the ammonia Avapor will not force the liquor up the pipe 16, ap-

preciably above the level thereof in the re-v tort, because the pressure'in the pipes 15 and 16 is substantially equalized. And, on account of the slight pressure in the 'pipe .15

ynecessary to unseat the ball or check valve 17, there will only be a slight but negligible rise of the liquor in the pipe 16, as will be readily understood. The ammonia vapor or gas which is disen gaged from the liquor in the retort passes through the return valve 10 and the pipel terminal 7 of the condenser coils into the latter, and at this point it will be understood that when the valve actuating member 34 of the cycle-changing device is in such a position that the gas control valve 29 is open to the passage of gas to the burner or heater, the three-Way Water control valve 43 is in such position that thelwaterlis free to pass therethrough into the vvateiL feeding pipe 5 which discharges thecooling Water into the condenser Water tank This water flowing .into ,the Water tank 4 cools the con denser 'coils 3 and consequently the vapor or gas contained therein, and from the said .coils 3 the cooled refrigerant vapor orv gas passes through the circulating pipe terminal 8 to a suitable refrigerant liquid receiver and expansion valve (not shown) and thence to the l refrigerating coils in the usual manner. i' y In further reference to the action involved during the generating cycle, it Will be noted vthat the operation described Will continue -until practically all of the ammonia is driven from the liquor in the retort. at

Which time the pressure in the cooling eX-V pansion coil (not shown) Will be relatively high. When the high pressure in the said cooling expansion coil reachesI a predetermined degree, the motor parts will have assumed such positions as to cause the sector or valve actuator 34 to shift in a direction that will turn 0H the gas control valve 29, and turn the three-way Water control valve 43 to a position vvhich.cuts off Water from the pipe 5 supplying the condenser( tank, and turns onl the Water through 'the feed pipe 47 leading to the cooling vspray p ipe 2.

This operation cuts off the heat from the generator-absorber retort and initiates the vcooling thereof, the effect of the cooling caused to pass through a circulatingpassage 9, into the return pipe 16, thence into the re` turn pipe discharging member 21, and out through the discharging opening 22 passing into the body of the liquid'in the tank, facilitating solution. It will be understood, that the Weak cold liquor inthe tank has such a strong aliinity for the ammonia vapor O r gas, that the latter Willbe drawn bito from the`entire system-until the pressulili,l efrein is very low, at or beloW` one atmosphere. The motor is also timed or Isynchronized to that condition. That is toA say, atfthis juncture in the absorbing cycle, the parts Will have assumed positions Whereir'rthe cam wheel is ready to swing the sector or valve actuator 34, so as to again turn on the gas to thej burner for the retort, to turn olf the Water fromthe spray pipe, and to turn it into the water feeding pipe for the condenser, thereby restarting the generating cycle.v And, these cycles are automatically p and alternately repeated` While the machine Vor apparatus is in operan, v

From the foregoing,it is thought that the constructi-on, operation, and many. advantages of the herein-described improvements in refrigerating systems'and machines will 5 be readily understood Without further description, but it may further be noted that changes in the form, proportion, and minor details of construction may be resorted to Without departing from the spirit of the inventi-on or scope of the appended claims.

I claim:

l. In a refrigerating machine, a generating-absorbing unit including a retort, a condenser, heating and cooling means for the retort, and a Water feed pipe for the condenser, a gasecontrol valve for supplying fuel to the heating means, a Water-control valve for supplying Water to said cooling means, and to the condenser, an actuator segment common to both valves, a motor for operating said actuator segment to alternately open and close said valves at predetermined intervals.

2. In a refrigerating machine the combination With an extraneoussource of power of a generating absorbing unit including heating and coolingmeans, a gas-control valve for supplying fuel to the heating means, a Water-control valve for supplying .Water to the cooling means, amotor Supported in an exposed position on a suitable part of the machine, and operated from said source of power, and a oycle-changing de vice actuated by saidv motor and including a valve actuator operatively connected With both valves and arranged to actuate the same alternai `ely.

3. In a rerrigerating machine, a generating-absorbing unit including heating and 49 cooling means, control valves for both the heating and `cooling means, and a'motor operated cycle-changing device including an oscillatory valve actuator operatively connected with both valves, a rotatable cam -345 Wheel having a camming engagement with said actuator, and a motor for turning said Wheel.

4. In a refrigerating machine, a generating-absorbing unit including heating and 50 cooling means, control valves for both the heating and cooling means, and a motor operated cycle-changing device including anl oscillatory valve actuator operatively connected With both valves, a rotatable cam Wheel having a camming engagement With said actuator, and a Water motor for turning said Wheel.

5. In a refrigerating machine, a generat- I ing-absorbing unit including heating and cooling means, control valves for both the heating and cooling means, and a motor operated cycle-changing device including an oscillatory valve actuator operatively connected with both valves, a rotatable cam wheel having a cammjng engagement with comprising an oscillatory valve actuator op-` -eratively connected with said valves, a rotatable cam Wheel having a camming ensaid actuator, and a Water motor for turningsaid Wheel and operated from the cooling Water supply.

6. In a refrigerating machine, a generating-absorbing unit, including heating and cooling means, and control, valves therefor having controlling pinions, and an automatic cycle-changing device including an oscillatory gear sector meshing with said pinions.

7. In a refrigerating machine, a generating-absorbing unit, including heating and cooling means, and control valves therefor having controlling pinions, and an automatic cyclechanging device including an' oscillatory gear sector meshingvvvith said pnions, and provided. `4With a crank arm, and a motor propelled cam Wheel having a groove engaging said crank arm.

8. In a re 'rigerating machine, a generating-absorbing unit including' heating and cooling means and control valves therefor, and an automatic cycle-changing device comprising an oscillatory valve actuator operatively connected With said valves, a rotatable cam Wheel having a camming engagement vWith said' actuator, a pawl and lratchet mechanism for advancing said Wheel, and a motor for operating the pavvl and ratchetmechanism.

. 9. In a refrigerating machine, a generating-absorbing unit including heating and cooling means and control valves therefor, and an automatic cycle-changing, device `gagement with said actuator, a paWl and ratchet mechanism for advancing said Wheel, and a reciprocating Water motor for operating the pavvl and ratchet mechanism.

10. In a refrigerating machine, a generatvingabsorhing unit including heating and cooling means and control valves therefor,

I and an automatic cycle-changing device comprising an oscillatory valve actuator operatively connected with said valves, a rotatable cam Wheel having` a camming engagement With said actuator, a pavvl and ratchet mechanism for advancing said Wheel, and a reciprocating slow-speed Water motor for operating the pavvl and ratchet mechanism.l

11. In a refrigerating machine, a generating-.absorbing unit including heating and cooling means and control valves therefor,

comprising an oscillatory valve actuating operatively connected With said valves, caro-I tatable cam Wheel having a camming engagement With said actuator, a pavvlland ratchet mechanism for advancing said..

and an automatic cycle-changing'wrlevice f' l2. In a refrigerating machine, a generating-absorbing unit including heating and cooling means, and control valves therefor having controlling pinions,' and an automatic cycle-changing device including an' oscillatory gear sector meshing with said.`

pinions provided with an arm carrying a bearing roller, a rotatable cam wheel having a cam groove engaging said bearing roller, a pawl and ratchet mechanism for advancing the cam wheel, said mechanism having adjustable stroke-determining means, and a reciprocating motor for actuating said mechanism.

13.V In a refrigerating machine, a generating-absorbing unit including heating and cooling means, and contro-l valves therefor having controlling pinions, and an automatic cycle-changing device including an oscillatory gear sector meshing with said pinions provided with an arm carrying a f bearing roller, a rotatable cam wheel having a cam groove engaging said bearing and an automatic check pawl, and a reciprocating motor for actuating said mechanism.

14. In a refrigerating machine, a generating-absorbing unit includingfheating and cooling means, and control" valves therefor having pinions, and anwautomatic cyclechanging device comprising an oscillatory gear sector meshing with said pinions, a cam wheel operatively engagingthe sector, a pawl and ratchet mechanism Jfor advancing the cam wheel, said mechanism having a swinging pawl carrier, adjustable strokedetermining means, a retracting spring for the pawl carrier and an automatic check pawl, and a reciprocating Water motorhaving a stem-provided with an adjustable tappet screw 'engaging with the pawl carrier.

ln testimony whereof I hereunto 'afix my signature in the presence of two witnesses.

A. J. WATSON, 0. D.KAISER. 

